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Explain how to omit dynamic attributes #745

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Dec 13, 2020
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Explain how to omit dynamic attributes #745

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6 changes: 4 additions & 2 deletions src/guide/template-syntax.md
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Expand Up @@ -49,13 +49,15 @@ Mustaches cannot be used inside HTML attributes. Instead, use a [`v-bind` direct
<div v-bind:id="dynamicId"></div>
```

In the case of boolean attributes, where their mere existence implies `true`, `v-bind` works a little differently. In this example:
If the bound value is `null` or `undefined` then the attribute will not be included on the rendered element.

In the case of boolean attributes, where their mere existence implies `true`, `v-bind` works a little differently. For example:

```html
<button v-bind:disabled="isButtonDisabled">Button</button>
```

If `isButtonDisabled` has the value of `null` or `undefined`, the `disabled` attribute will not even be included in the rendered `<button>` element.
The `disabled` attribute will be included if `isButtonDisabled` has a truthy value. It will also be included if the value is an empty string, maintaining consistency with `<button disabled="">`. For other falsy values the attribute will be omitted.

### Using JavaScript Expressions

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